2. amps-preamps
  3. 176412-7415

Fuse Direction for Pass Labs Amp and Preamp

I am going to re fuse my Pass X250.8 and XP-32 with Synergistic Research purple fuses in a couple of days. I was hoping to get advice on a rule of thumb for direction of the fuses. My instinct tells me to start by installing the fuse by the direction of the lettering on the fuses. I am thinking that the direction should be the lettering left to right with the beginning of the lettering facing out of the amp and the end of the lettering facing into the amp. Does this sound right?

128x128mitchb
nonoise's avatar
nonoise
10,928 posts
 

No need to as it the Technics sounds fantastic the way it is. 👍

willgolf
939 posts
 

Op...you really need to try one fuse at a time.  Otherwise, you won't know which component sounds good or bad.  My beef with SR is that they don't tell you the direction.  With QSA fuses they do.  I have all QSA yellow fuses in my system.

mrskeptic
262 posts
 

I'd say have your significant other (if you have one) or friend install the fuse(s) so that you can't see them, play your favorite tune, then have the same person (for continuity) reverse it, again without you seeing it, play the same tune and realize there is no difference and you wasted your money.

gregm
3,409 posts
 

May I suggest something that might help?

Wipe both ends of the fuses before placing them all in the devices in the same way (i.e. writing left to right, or otherwise, your choice). Secure them in place, switch on the device and play the music. Thereafter I strongly suggest you let the fuses be.

IF you feel the need to experiment give it at least two mins operating time before changing.

(I was given designer fuses and installed them in my DAC & phono. They work very well, no audible differences though.)

 

helmholtzsoul
111 posts
 

Never keep reversing the fuse, NEVER wipe the goo off the fuse, NEVER.

Install the fuse and let it play if you think it's wrong, wait for at least a day. Then with fresh ears reverse the fuse. IF it sounds better leave if it doesn't put back the way it was. 

The fuse holder should have been inspected before you installed ANY fuse and replaced if there is damage.

The main reason for a phono sections lack of change is because the very low current draw they have through the wires. I've rewired tone arms that took 500+ hours to break-in, the fuse took at least 1/2 of that time.

Power amps, put it in, if you can't hear a difference, get your money back, it's as simple as that. The better the Power supply the less you'll notice it..

Big Macs and Pass amps, LOL who has better power supplied? Not many.

Even Mcintosh finally got it through their thick heads, they SELL cables NOW and I'm a huge Mac fan. 

As I look across the very flat earth. It can't be round.

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